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If all other deployment methods do not work, CGI will work for sure.
CGI is supported by all major servers but usually has a sub-optimal
performance.

This is also the way you can use a Flask application on Google’s App
Engine, where execution happens in a CGI-like environment.

Watch Out

Please make sure in advance that any app.run() calls you might
have in your application file are inside an if__name__=='__main__': block or moved to a separate file. Just make sure it’s
not called because this will always start a local WSGI server which
we do not want if we deploy that application to CGI / app engine.

With CGI, you will also have to make sure that your code does not contain
any print statements, or that sys.stdout is overridden by something
that doesn’t write into the HTTP response.

Usually there are two ways to configure the server. Either just copy the
.cgi into a cgi-bin (and use mod_rewrite or something similar to
rewrite the URL) or let the server point to the file directly.

In Apache for example you can put something like this into the config:

ScriptAlias/app/path/to/the/application.cgi

On shared webhosting, though, you might not have access to your Apache config.
In this case, a file called .htaccess, sitting in the public directory you want
your app to be available, works too but the ScriptAlias directive won’t
work in that case: